Locomotive.



W. J. BOHAN.

LOCOMOTIVE.

APFLICAIION mu) SUI. I5. 1915.

I 1 ,274,376. Patented Aug. 6, 1918.

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WILLIAM J. .BOHAN,'0IF ST. PAUL, MINNESOTA.

LOCOMOTI VE.

Specification of Letters Patent.

itatcntcd lin 6, 193 8.

Application filed September 15, 1915. Serial No. 50.834.

lie it known that l. ll'umnu llamas, a

citizen of the lfnited States, rcsiding at. St. Paul, in the county of Ramsey and b'tato o'l ..\linncsota. have invouted certain nw-i and useful lmprovelm-nts in lmcomotivos; and 1 do hereby declare the following to be a full, clear, and exact description of the, invention such as will enable others skilled in the, art to which it appertains to make, and use the same.

; My invention relates to locomotives and has for its objectto so improvc the same that a maximum load pulling etlicicncy is obtained. both in respect o the weight of the. locomotive and in respect to tho tucl consumption.

These objects I attain by a novel colipeh ativc arrangement, with tht usual steam cylinders and drive. wheels actuated therefrom. of auxiliary motor trucks operated by a generator or dynamo driven by a steam engine, pret'erably a steam turbine. which latter is driven from steam generated in the locomotive boiler, and for economy, driven by the exhaust from tho locomotive cylin ders. This improved locomotive 1 term "a turbo-electric compound hicomotive."

1 th prefer-rod embodiment. of tho invention. the main weight is carried on a multiplicity of drive wheels driven in the customary way from tho steam cylinders, but a very considerable. part of tho weight ol the locomotive, to-wit. of the front por tion thereof, is carried on a front, truck, the wheels of which are driven by electric Inotors supplied with current from a generator driven by a steam turbine, which in turn,

is driven by the exhaust steam from the loco motive cylindors. Also. the trucks undor tho tender are driven by electric motors supplital with current from the abovo noted turbino driven generator. The best practice is to employ a steam turbine to operate the elec t1i ;;;'citerat( r or dynamo, but it is possiblc to employ other forms of steam engine tor this purpose.

The tender carrics a condenser. and tho oxhaust t'rom the steam turbine is connected to this condenser. l rom tho condenser, the condonsctl steam or condensate and the circulating. watcr is pret'crably pumped to and passed over plates of a cooling tower which is also carried by tho louder and from Whicn the cool water is delivered baclt into the water tank of the tender. The food water to the boiler is drawn from the condenser at r a point where the water is of quitc high tone pcrature.

The accompanying drawings illustrate a turbo-electric compound locomotive dcsigncd in accordance with my invontion. In the said drawings, like. characters indicate like parts throughout the, several views. illoiterrin tg' to tho drawings:

Figures 1 and l aro supplemental views in side elevation, partly in diagram and with some parts sectioned, showing a locomotive cmbodyin; my invention;

Fig. 2 is a diagrammatic view showing the circuit connections from the dynamo to the several motors.

()t' the parts ot the locomotive proper, the numeral 1 indicates the boiler, the numeral 2 the cab. the numeral 3 the cylinders, the numeral -t the main drive wheels. the numeral t3 the feed water pump. the numeral 7 tho main steam pipe from boiler to cylinders. and the numerals S, t) and 9", respco tively, tho frame. the front wheels and axles ot' the front. truck which carries a very considerable part of the weight of tho 'lront part oi the locomotivo boilor. The truck frame 8 carries electric motors 10 that are geared to the axlest ot' the said front truck. is shown. the ll'llt'l{ frame 8 is connected to the trout heads of the cylinders 3, by articulate joints 11. The said front truck is. as shown. provided with front or pilot; wheels 12 diagrannnatically indicated in Fig. t. The front portion of this said truck carries a turbo generator set made up of an electric generator or dynamo 13 and a steam turbine 1-1, the latter being connectod to drive the Former, and both boing of any suitable well known construction For instance, the said steam turbine l may be, of "the type known as a low pressure or exhaust steam turbine. 'lhc numeral 15 indicates oxhaust pipes from the locomotive cylinders 3 to the steam turbine ll, and as shown, has a chi-cl; valve to hecking a revense flow. The exhaust pipe 15 is onnected to tho locomotive exhaust nozzle 16, by a branch exhaust pipe 17 in which is interposed an ovcr-pressure valve 17 set to open, say under a prca-au'c of tire pounds, so that the surplus; exhaust steam in oxcoss ot' five pounds. will be. discharged through the oxhaust nozzle. The construction of such valves is well known. The exhaust port f the said steam turbinc is connected. by a long rearwardly extended pipe 18, to a condenser 19, which, as shown, is built into the rear portion of the water tank of the tender 21. This tender 21 is carried on trucks made up of truck frames 22, truck wheels and axles 24. The truck frames 2% carry electric motors25 that are geared to the axles 24 so that the said motors drive the wheels 23 and cause them to act as auxiliary traction wheels. Between the engine and the tender, the front and rear portions of the exhaust pipe 18 are connected by a flexible hose 26'.

The chamber in which the condenser 19 is located, is cut off from the main portion of the water tank 20 by a partition 20% The main body and the said compartment of'the Watertank and the compartment containing the said condenser, are connected by a circulating pipe 27, through a circulating pump 28, preferably of the rotary type. A suction pipe 29 extends from the bottom of the-condenser 19 to a so-called condensate pump 30, which latter has a discharge pipe 31' terminating in a nozzle located in a position to discharge onto the upper tray of a cooling tower 33, from which the condensed water runs back into the main compartment of the water tank 20. A feed water pipe 34 extends from the condenser 19 to the feed pump 6, and the customary feed water pipe 35 leads from the said pump to the locomotive boiler. Within the locomotive cab is an electric motor controller for multiple-control of the motors on the engine and tender. This controller and other electric connec- Lions are shown'diagrammatically in Fig. -2.

The condenser 19 has vertical tubes connecting upper and lower chambers thereof, and the intermediate chamber of the said condenser has an inlet 19 and an outlet 19". Extending from the top of the chamber in which the said condenser is located, is a pipe 32 that terminates in a spring head 32 located in position to discharge onto the plates of the cooling tower 33. Here it may be noted that the said cooling tower has slightly inclined alternated plates located, one over the other.

The steam exhaust pipe 15 receives the exhaust from both cylinders 3, and at a point forward of its check valve 15 is connected to the delivery end 015;), long live steam pipe 36,the rear end of Which extends through the engine cab, taps the rear end of the.

boiler above the Waterlevel and is provided with a valve 37 within reach of the engineer.

By the .above described arrangement, all, or substantially all of the wheels, both of the locomotive and of the tender are utilized as traction wheels; the main drive wheels being operated by steam and the other wheels being operated by electric motors.

Thus-all, or. substantially all of the weight of the locomotive or tender are rendered available for traction purposes, and furthermore the electric motors give a continuous application of power which is especially important when the engine is running at slow speeds, as when climbing heavy grades. The locomotive is thus made highly efficient for mountain traffic, but; is, nevertheless, very eflicient for all railway service. A high load pulling efiiciency for a given expenditure of fuel is also another highly desired result attained.

Under ordinary conditions, and for the sake of economy, the steam turbine which operates the electric generator will be driven from the exhaust from the. locomotive cylinders. When, however, a maximum power is required, as in starting a heavy loador in climbing steep grades, live steam may be admitted to the steam turbine, through the pipe 36, when the valve 37 is open. In starting a train, the electric motors othe'front truck of the engine will be use and the electric motors on the trucks of the tender will be cut in and used as boosters, after sufficient speed has been acquired to cause the electric generator 14 to supply the required current.

Various different arrangements of circuits, switches, and controlling devices, between the electric generator or dynamo 14 and the several truck motors,-may be employed. However, in Fig. 2, I have diagrammatically illustrated a complete system for this purpose, which, however, need he only briefly described for the purposes of 100 this case.

The generator 14 is preferably of the compound Wound type. In the said diagrammatic View, Fig. 2, the generator and motors are diagrammetically shown. The 105 various circuits will not, for the purposes of this case, be'speoifically followed, but are clear from the diagram itself. The said circuit connections include a generator shunt field controller indicated as an entiret by 10 the numeral 38, and a forward an reverse rex'erser indicated as an entirety bv thc numeral 39. These two devices 38 and 39 are all well known types and are usually embodied in a controller housing which would be located within the engineers cab.

in the arrangcn'ient illustrated in the said diagram view, Fig. 2, the shunt field resistance is connected to the mrrespondmg bars oi the controller and'coutrols the output of obtained in an engine of given weight and the tendency of the wheels to slip, with incident stress on parts, is reduced to a minimum. Also, great economy in the use of Fuel is secured. operate this auxiliary power device may, under most conditions, be driven from the exhaust from the engine cylinders. 13y such arrangement, all, or nearly all, of the wheels of the locomotive, including those of the tender, are utilized, as traction wheels. The steam turbine will be arranged to exhaust into the condenser, wherein 'a partial vacuum of twenty inches vacuum, more or less, will be maintained. Part of the exhaust from the locomotive cylinders, will, under most conditions, be available in producing forced dra'l t by a discharge through the exhaust nozzle of the locomotive; but when found necessary, an auxiliary blast producing de vice, such as a fan or blower, may be employed. Such a fan or blower of proper capacity, may, however, be driven by force which is very much less than that which is obtained in the steam turbine and electric inot'ors by the use of exhaust in the manner described.

What I claim is:

1. In a locomotive, the combination with a steam cylinder, drive wheels and connections between the same, of a truck associated with said locomotive, an electric motor for driving the wheels of said truck, and an electric generator supplying current to said motor, and itself driven by a force generated in the locomotive boiler. 5

2. In a locomotive, the combination with the stean't cylinders, drive wheels and con nections between the same, of a truck associatcd with said locon'iotive, an electric inotor for driving the wheels of said truck, an electric generator supplying current to said motor, a steam motor for driving said generator, and steam connections from the locomotive boiler to said steam motor.

3, In a locomotive, the cmnbination the steam cylinders, drive wheels and connections between the same, of a truck sup porting a part of the weight of the locomotive, an electric motor for driving th wheels of said truck, an electric generator supplying current to said motor, a steam motor for driving said generator, and steam connections from the locomotive boiler to said steam motor.

4. In a locomotive, the combination with the steam cylinders, drive wheels and connections between] the same, of a truck supportin a part of the weight of the locoinoti've, eectric motors for driving the wheels of said truck, an electric generator supply-- ing current to said motors, a steam motor for driving said generator, and steam connections leading horn the exhaust from the locomotive cylimlers to said steam motor.

with

The electric motors which 5. In a locomotive, the combination with the steam cylimlers, drive wheels and driving conne tions between the same, of a front truck supporting the front, end of the boiler, an electric motor for driving the wheels of said truck, an electri generator on said track for driving said trneh wheels, a steam turbine on said trncl; for driving: said generator, and steam tullllttlllllh from the loco motive boiler to said steam turbine.

(3. in a locomotive, the combination will: the steam cylinders, drive wheels and driving connections between the same, ot a truck supporting the vfront portion of said locomotive, electri motors for driving: the wheels of said truck, an electric generator on said truck for supplying current to said motor, and a steam turbine on said truck connected to the exhaust from the engine cylinders.

7. In a locomotive, the combination with the steam cylinders, drive wheels and driving connections between the same, ol a truck supporting the front portion of said locomotive, elcctric motors for driving the wln'sls of said truck, an electric generator on said truck for supplying current to said motor, a steam turbine on said truck connected to the exhaust from the engine cylinders, and a condenser connected to the exhaust l romsaid steam turbine.

8. In a locomotive, the combination with the steam cylinders, drive wheels and driving connections between the same, of a lrucl; supporting the front portion of said locomotive, electric motors for driving the wheels of said truck, an electric generator on said truck for supplying current to said motor. a steam turbine on said truck connected to the exhaust from the engine cylinders. and a cont'lenser incorporated in the water tank of said locomotive and connected to the ex hanst from said steam turbine.

9. la a locomot' e, the combination with the steam cylinders, drive wheels and connections between the same, oi a truck sill) porting a part of the weight of the locomotive. electric motors for driving the wheels of said truck, an electric generator supplving current to said motors, a steam motor tfor driving said gen alor,stean1 connections :li'Ull! the lot'omotivn boiler to said steam motor, a condenser incorporated in the water tank of the locomotive, and {red water eon; neetions from said condein er to the loco motive boiler.

It). In a locomotive, including a tender having: a water tank, the rombinaiion with the steam rrlinders, drive wheels and drivinc com'iections between the same. ot' a front truck supporting the front end ol the loci motive boiler, electric motors applied to drive the wheels of said trurk, other electri motors applied to drive the wheels oi the tender trucks, an electrir generator supplying current to the said sever cl motors, a

steam motor on said front truck for driving said generator. and steam connections between said boiler and said steam motor.

11. In a locomotive, including a tend? having a water tank. the combination wit'i the steam cylinders, drive wheels and driving connections between the same, of a front truck supporting the front end of the loco motive, electric motors applied to drive the wheels of said truck, other electric motors applied to drive the wheels of the tender trucks, an electric generator on said front truck supplying current to the said several motors, a steam motor on said front truck for driving said generator, steam connections between said boiler and said steam motor, and a common controller for the several motors, located in the engine cab;

12. In a locomotive, including a tender having awater tank, the combination with the steam cylinders, drive wheels and driving connections between the same, of a front truck supporting the front end of the locomotive oiler, electric motors applied to drive the wheels of said truck, other electric motors applied to drive the wliei ls of the tender trucks, an electric generator on said front truck supplying current to the said several motors. a steam motor on said front tri ck for driving said enerator, steam connections between said boiler and said steam motor, and a condenser incorporated in the water tank of said tender and connected to the exhaust from .said steam motor.

13. In a locomotive, i eluding a tender having a water tank, the combination with the steam cylinders, drive wheels and driving connections between the same, of a front truck sppportin the front end of the locomotive boiler, electric motors applied to drive the wheels of said truck, other electric motors applied to drive the wheels of the tender trucks, an electric generator on said front truck supplying current to the said several motors. a steam motor on said front truck for driving said generator, steam connections between said boiler and said steam motor, a condenser incorporated in the water tank of said tender and connected to the exhaust from said steam motor, and a. feed water connection from said condenser to the locomotive boiler.

14. in a locomotive. the combination with the steam cylinders, drive wheels, and con nections between the same, of a truck supporting part of the weight of the locomotive. an electriomotor for driving the wheels of said truck, an electric generator supplying current to said motor, a steam motor for driving said generator, steam connections between the locomotive boiler and said steam motor, a condenser carried by the locomotive, and a steam exhaust conduit connecting said steam motor to said condenser.

15. In a locomotive, the combination with to said condenser, and circulating connec- 1 tions from said condenser and water tank leading to said cooling tower and from said cooling tower back to said water tank.

a 16. In a locomotive having a plurality of traction Wheels, the combination with a steam cylinder and connections between the said cylinder and some of said wheels for driving the latter, of a turbine, connections including electric motors between said tiirbine and others of said wheels for driving the latter, said turbine being actuated by steam generated in the locomotive boiler.

.17 In locomotive having a plurality of traction '\vlieels, the combination with a steam cylinder and a turbine. of connections between said cylinder and some of said wheels. and between the turbine and some of said wheels. and means for supplying steam to both said cylinder and said turbine from the locomotive boiler.

18. In a locomotive having a plurality of traction wheels, the combination with a steam cylinder and connections between said cylinder and some of said traction wheels, for driving such wheels. connections including electric motors for driving others of the said traction wheels, an electric generator carried by said locomotive. having connections t'or supplying said motors with current to drive the same. and a steam motor carried by said loeomotiveto drive by steam said generator from said locomotive.

1t). Ina locomotive having a plurality of traction wheels, the combination with a. steam cylinder and connections between said steam cylinder and some of said wheels for driving the latter. an electric motor, connections between said motor and others of said wheels for driving the latter, a turbo-generator set for supplying current to said motor, said turbo-generator set being supplied by steam from the locomotive boiler.

20. in a locomotive andits tender. each having traction wheels, the. combination with a. steam cylinder, connections between said cylinder and some of said wheels for driving the latter, of electric motor drives for others of'said wheels, and means deriving their energy from steam generated in the locomotive boiler for actuating said motor drives.

21. In a locomotive and its tender, each having a plurality of traction wheels, the combination with a steam cylinder and conmotors for driving others of said wheels,

and means for supplying electricity to said motors, which means derive their energy from steam generated in the locomotive, said means being carried by the locomotive.

22. In a locomotive and its tender having.

each a plurality of traction wheels. the combination with steam cylinders on the locomotive and driving connections therefrom to some of said wheels, of a turbo-generator set carried by the locomotive and operated by steam from the locomotive boiler, and electric motors connected with others of said wheels and energized by current derived from the turbo-generator set.

23. The combination with a steam locomotive, of an electric generator, motors adapted to be actuated from the generator to supplement the power of the steam locomotive, a

turbine for actuating the generator adapted to be driven by steam exhausted from the locomotive, a condenser connected with the exhaust outlet of the turbine, and means for conducting water from said condenser to the locomotive.

24. The combination with a steam locomotive, of an electric generator, motors adapted to be actuated trom the generator, a turbine t'or actuating the generator, means fore-onducting steam exhausted from the steam locomotive to the turbine, a condenser connected with the exhaust outlet of the turbine, means for conducting heated water from the condenser to the boiler of the steam locomotive, a cooling towcr,,means for conveying water from the condenser to the cooling tower, and a storage tank or reservoir for water for the boiler of the locomotive connected with said tower to receive cooled water therel'rom.

25. In a locomotive having a plurality of traction wheels, the combination with a steam cylind and connections between said cylinder and some of said wheels for driving the latter, of an electric motor carried by the locomotive, connections between said m0- tor and other of said wheels for driving the latter, and a steam motor supplied by steam from the locomotive, for generating current to supply said electric motor.

In testimony whereof I afiix my signature in presence of two witnesses.

WILLIAM J. BOHAN. Witnesses ELI R. Manon, GEORGE F. ENDICOTI. 

